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  PSY340: Statistics for the Social Sciences

Lab 19:

 

Part I:

1) (12.3 from book) A psychologist at a private mental hospital was asked to determine whether there was an clear difference in the length of stay of patients with different categories of diagnosis. Looking at the last four patients in each of the three major categories, the results (in terms of weeks of stay) were as follows.

Diagnosis Category
Affective DisordersCognitive DisordersDrug-related Conditions
7128
6810
5912
61110

Using the alpha = 0.05 level, is there a significant difference in length of stay among diagnosis categories? Show all 5 steps of hypothesis testing.

ANOVA solution

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